The pink forum badge icon is the Apex Predator icon awarded from completing the final mission, mission 3, in Hyper Vanguard IV on Hyperpink mode. Mission 3's Hyperpink mode is unlocked when you finish all 3 achievements on normal difficulty. Took me a damn long time (a few hours of playing) to get it! PS: I got this the day the mini-game was released during the Vanguard concept sale (30 March to 6 April 2015). Yeah, it took me this long to get off my lazy ass to make this post.